| gearing and exhaust questions
hey guys i have a lucky7 pocketbike, the old engine died(43cc) and so i bought a new s'pposedly 49cc one (it says ZH-2 at the base4 of the cylinder) and fitted it to my bike using the old exhaust. My mate has a bike with the same engine and it tops out at prolly 65km/hr stock, mine is closer to 45km/hr, now his goes the same as another of our mates who has a 7 tooth front sprokcet so i'm assuming his too has a 7 tooth sprocket, i know mine has a 6 tooth front sprocket and it feels like it could go faster if the gearing were changed. BUT, and i apologise for this long assed way of writing, i've been told that stock pocket bieks come with 6 teeth front sprockets so my quesiton is basically what is holdingmy bike back????
My mates bikes both have the same stock exhaust but mine is different to theirs, is it the exhaust? Is it my front sprocket?
and i find with this new engine and full throttle i get a surging sorta sensation the bike doens't rev out cleanly at all what the hells that about? (from reading other posts i'm thinking some fuel flow thing)
anyhoo i'm an idiot with a spanner so any help would be greatly appreciated!
johnny :P  | 
